Christina Grimmie's killer was on a mission to make himself so appealing she couldn't resist him, and when it didn't work he changed his plan to kill her ... this according to his former co-workers.

Various people who worked with Kevin Loibl tell TMZ his infatuation with Christina was boundless. He went on a mission to change his appearance for her and, toward the end, got hair transplants and Lasik eye surgery. He also went vegan to lose weight.

He would also listen to her music at work and vow she would someday be his wife.

Loibl's Best Buy co-workers say he went to one of Christina's shows in March and hinted that he actually met her. The co-workers also say the Geek Squad killer claimed to have played online games with the singer. A source close to the singer, however, tells us Christina never had contact with Loibl.

And there's this. The co-workers say they teased Loibl that he would never score because Christina had a boyfriend ... her producer. That relationship was never public, but pictures of Christina and the guy together on social media made it pretty clear ... they were together. We're told that enraged Loibl.

That rage was vented last Friday after Christina's show, when he shot her in the head and then killed himself.

The body of the missing 2-year-old boy has finally been located after an exhaustive search ... and after analyzing the remains, cops believe the alligator drowned the child.

The name of the boy was also released ... 2-year-old Lane Graves from Elkhorn, Nebraska -- and his parents, Matt and Melissa.

The Orange County sheriff said Lane's body was located 10-15 yards from where he was pulled under water ... in about 6 feet of water. They said the body is still intact.

A rep for Fish and Wildlife said they will run forensics on the 5 gators they've pulled out of the Seven Seas Lagoon to determine if one of them is responsible for the child's death. They said if they can't find a match ... they'll continue searching for the culprit.

As we previously reported ... there were no signs warning of alligators in the water at the Disney Resort.

Justin Bieber protege Madison Beer is understandably freaked out by the murder of Christina Grimmie, but she's not going to deny her fans face-to-face contact.

Our photog got Madison, who's managed by Scooter Braun, out in WeHo Tuesday, and she made it clear ... she is deeply affected by Christina's death, both personally and professionally.

You hear Madison's conflict as she tries to reconcile prudent safety measures with the business of music.

Christina Grimmie's New Jersey hometown came out in droves Monday night for her candlelight vigil.

Hundreds reportedly showed up to the Marlton Memorial Sports Complex in Evesham, New Jersey to hear her brother, Marcus, the mayor and best friends speak about her all too short life.

Marcus also paid tribute to the 49 slain victims of the Orlando mass shooting, pointing out they'd been staying only 4 miles away from Pulse nightclub.

22-year-old Christina was fatally shot Friday night in Orlando during a fan meet and greet following her concert.

One of the victims in the Orlando massacre was a former 2-sport college athlete ... who graduated from Post University in 2001, TMZ Sports has learned. 

Kimberly "KJ" Morris was working as a bouncer at Pulse when the gunman stormed the popular LGBT nightclub and opened fire -- killing 37-year-old KJ and 48 others. 

We spoke with a rep for Post University in Waterbury, Conn. who confirmed KJ played Division II basketball there from '97 to '99 -- and then switched to volleyball from '99 to '01. 

"The Post University community is deeply saddened by the death of 2001 graduate Kimberly 'KJ' Morris," a University spokesperson said in a statement.

"She earned her Bachelor of Science degree as a resident student of the University’s Waterbury campus and is remembered as an active, vibrant student-athlete and leader within the Post family."

"Our thoughts and prayers are with Kimberly’s family and friends, and the many Post alumni who have contacted us to share their memories of this wonderful young woman."

The Milwaukee Police Dept. says poppers, marijuana and alcohol were found in the motel room where ex-NFL lineman Bryan Robinson died.

According to an official report obtained by TMZ Sports, the 41-year-old checked in to the Midpoint Motel around 9 AM on Saturday with another man -- black male, thin build and dreadlocks.

Staffers say Robinson was a "regular" at the hotel and usually checked out at 6 PM -- and got concerned when he didn't leave at his usual time. So they checked on the room and found Robinson lying face down on the bed.

Officials say there was no sign of trauma -- but investigators did find marijuana, an empty bottle of Jungle Juice Plus poppers, Crown Royal and a bottle of lubrication. 

The coroner noted that Robinson had "petechial hemorrhages."

According to the police report, the other man left the motel between 4 PM and 5 PM. 

Officials say Robinson's wife was contacted -- and they informed her of his death. She said Robinson didn't have any medical problems and she last spoke with him Saturday morning before he left. 

Michu Meszaros, the circus star who played "ALF" for four seasons, has passed ... his longtime manager, Dennis Varga, confirmed to TMZ. 

He'd been rushed to an L.A. hospital over a week ago after being found unresponsive at his home and had been in a coma since.

Michu was born in Hungary and began performing in the circus in his teens. He was only 33 inches tall coining him the unofficial title as "the smallest man on earth." He eventually joined Ringling Bros. Barnum and Bailey Circus in the '70s.

He was close friends with Michael Jackson after the pop star saw him perform. Michu was reportedly a regular at Neverland Ranch, present during MJ's courtship to Lisa Marie and even knew Michael's kids. 

He landed the role of walkaround ALF in the '80s.

Varga has set up a GoFundMe page to help pay for funeral costs and medical bills. 

Michu was 76.

Officials have called off the search for University of Nevada football player Marc Ma -- who is presumed dead after going missing Friday during a paddle board trip on Lake Tahoe.

Ma -- a sophomore defensive end for the Wolf Pack -- was paddle boarding with 5 teammates when high winds caused dangerous swells. 

The others turned back and tried to get shore ... but noticed Ma was missing. A search and rescue was launched in an effort to locate Ma but were unable to find him. 

The Placer County Sheriff's Office is now calling the search one of recovery, not rescue.

Head coach Brian Polian issued a statement saying the team is devastated -- adding, "Our team has lost a friend and a brother and we are hurting right now. I have no doubt that we will rally together to love and support one another in manner that will honor Marc's memory."

"Marc was a very special young man and it was an honor to work with him. He was universally liked and respected by his teammates, coaches and staff. Marc excelled in the classroom and had grown by leaps and bounds in the weight room and on the football field. His easy smile and cheerful demeanor belied a fierce competitive nature that would emerge in practice and excite our team."

Former NFL lineman Bryan Robinson -- who spent 14 years in the league -- was found dead Saturday in a motel room in Milwaukee. 

Details surrounding his death are slim. Unclear why Robinson was at the motel. The Milwaukee Medical Examiner's office is investigating, according to the Chicago Tribune.

The 41-year-old -- who played for the Bears, Cardinals, Rams, Bengals and Dolphins -- was a solid NFL player. He played in Super Bowl XLIII with the Cardinals in 2009. 

Story developing ... 

Motorhead's Lemmy Kilmister's memory will live forever at his rock 'n' roll home -- The Rainbow Bar & Grill.

The famed restaurant/bar is a coveted part of the Sunset Strip ... the place John Belushi had his last meal the night he died, the joint where John Lennon threw back drinks, and the favorite haunt of Led Zeppelin, Elton John and countless other rock stars and celebrities.

The patio area at The Rainbow Bar & Grill is being renovated and re-named "Lemmy's Lounge" ... it's the place Lemmy always hung before his death last December. In an awesome move, they're using Lemmy's favorite bar stool as a focal point of the redesign.

And there's a  $20k bronze life-size Lemmy statue.

The project will be completed by the end of August. Rock on.

Former 'Voice' competitor Christina Grimmie is dead after a shooting in Orlando.

Christina was doing a meet and greet with fans Friday night following a concert ... when a man walked up to her and simply opened fire. Her brother tackled the shooter, but the man was able to get free enough to shoot and kill himself.

This picture was taken minutes before Christina was shot.

Christina was rushed to a hospital, but died early Saturday morning from her injuries. Police are hailing her brother as a hero for stopping the massacre of countless more people.

There are no words. We lost a beautiful soul with an amazing voice. Our hearts go out to the friends, fans and family of @TheRealGrimmie.

— The Voice (@NBCTheVoice) June 11, 2016

Christina had opened Friday night for the band, Before You Exit. Since finishing in third place on "The Voice" Season 6 (2014) ... Christina signed with Island Records, and was reportedly working on an album.

Grimmie was 22.

We've learned Christina's twitter account was hacked, but her team has regained access and taken down the message. 

Muhammad Ali's memorial service was punctuated by emotional and humorous stories about his life ... as told by his family and famous friends.

Billy Crystal was a close friend and told the packed arena in Louisville about the first time they met ... and how Ali reacted to Crystal's impression of him.

Many, many others spoke during the nearly 4-hour long ceremony. A scruffy Crystal joked, "I was clean shaven when this started." 

Ali's widow, Lonnie ... 3 of his daughters ... Sen. Orrin Hatch and Bryant Gumbel also shared their memories.

President Bill Clinton delivered the final eulogy of the memorial, talking about the one thing Ali never got enough credit for -- his intelligence. 

A famed director is suing the W, claiming the hotel blocked him from rescuing his husband from suicide.

Norman Buckley, who directed "Gossip Girl" and "Pretty Little Liars," claims in a new lawsuit his husband, Davyd Whaley, had disappeared from their West Hollywood home in 2014 and checked into the W in Hollywood under an alias.

Buckley says Davyd was suffering from PTSD and paranoia and the hotel could tell at check-in something was terribly wrong. Buckley says Davyd appeared, "nervous, scared and fidgety."

According to the lawsuit, Buckley saw a credit card charge from the W and called the hotel, saying he was Davyd's husband and this was an emergency situation and Davyd needed his meds, STAT.

Buckley claims the hotel was unwilling to help ... in fact they wouldn't acknowledge Davyd was a guest.  

Buckley eventually got the Sheriff's Dept. to call the hotel, but by then it was too late. Davyd had killed himself in his room, several hours before.

The suit alleges had the W people treated it as a true emergency, Davyd would still be alive.

We reached out to the W. So far, no word back.