A 25-year-old YouTube bodybuilder from Massachusetts died late Thursday after he was tased by police who found him violently stabbing a woman he met on Tinder at his mom's home.

Cohasset police arrived to Erich Stelzer's residence around 10pm when they said he repeatedly slashed his date, newly identified by her family as 24-year-old veterinary assistant Maegan Tapley, in the face with a knife.

District Attorney spokesperson Peggie Krippendorf said in a statement: 'In an effort to rescue the victim and disarm Stelzer, Cohasset police officers used Tasers to subdue Stelzer.'

Stelzer became unresponsive soon after the tasing, and stopped breathing while being transported to the hospital.

Erich Stelzer, who has frequently posted videos to YouTube of his fitness routine, stabbed 24-year-old date Maegan Tapley, (pictured left Facebook) late Thursday. The bodybuilder later died after he was tased by police. The victim will likely lose her eye, police said

Tapley is seen in other Facebook photos sporting both light and dark hair colors

The victim, meanwhile, was treated for severe injuries. Police said she will likely lose her eye.

Tapley's mother, Susan Tapley, said in a statement seen on NBC Boston that her daughter will recover from the traumatic attack.

'She's going to mend, she's going to be alright.. it's going to take time to recover. She'll need plastic surgery and an eye specialist,' she said.

A source told WBZ-TV that Stelzer was in an 'altered mental state' or suffering a 'possible mental health issue' at the time of the domestic violence incident.

His neighbor, Fred Siegel, told the local station: 'It’s unfortunate you never want to see anybody get hurt and you certainly don’t want to see someone die over something.

The horrific incident happened at Stelzer's home in Cohasset, Massachusetts

Police arrived to the home around 10pm Thursday after they received a call about a 'disturbance'

'It’s unfortunate that it happened and who knows why it happened.'

It's currently unclear what transpired between the two before the brutal slashing that occurred just two days after Christmas.

The pair recently linked up on the popular hook-up dating app, Tinder. The man is estimated to be 6'8" and nearly 300lbs. The girl appears petite.

The District Attorney's office has not given word on a possible motive for the stabbing.

Further investigation is now underway.

Harry Stelzer, the father of the online fitness guru, took to his Facebook page Friday to share the news

He later shared a childhood photo of his late son, adding: 'My son. Killed by cops. Here comes the cover up'

Pictured: Harry Stelzer and his girlfriend Linda. Harry Stelzer is the father of Erich Stelzer, 25, who was Tasered by police before he died on December 27

Harry Stelzer, the father of the online fitness guru, took to his Facebook page Friday to share the news.

'I received some real bad news last night. My youngest child Erich Stelzer died last night. There was a violet confrontation at his house last nite. Police came and tased him 4 times. 4 times,' the distraught dad wrote.

'He died on the way to the hospital. 25 years old. He was my life. This is not over. Let me bury my dead and then the show begins. Rest In Peace my son. Love you for ever. I am hurting.'

He later shared a childhood photo of his late son, adding: 'My son. Killed by cops. Here comes the cover up.'

Tapley, a veterinary assistant, posted this image of herself with the caption: 'Feeling like a mad scientist in my X-ray gear'