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UPDATED at 4:30 p.m. with information about the victim.

ST. LOUIS COUNTY • A man who advocated for others in the region who have disabilities was attacked and killed by one of his own pit bulls in St. Louis County, authorities said.

St. Louis County police were called to the 2200 block of Redman Avenue near Spanish Lake about 10:30 a.m. Monday, authorities said. Police say Adonis Reddick, 45, was found dead and had bite marks on his body.

On Tuesday, authorities said “penetrating and perforating wounds to the victim’s neck” had caused his death.

Two of the man’s relatives who had not seen or heard from Reddick since Saturday went to his home to check on him and found him dead, said Vera Culley, a spokeswoman for the St. Louis County Police Department.

Two pit bulls, one of which was acting aggressively, were in the home, according to police. Authorities believe that the aggressive dog bit the victim.

Culley said investigators aren’t sure how long Reddick had been dead.

Culley said officers shot and killed the aggressive pit bull inside the home because police and animal control officers could not control it. The other dog was calm and was taken into custody for evaluation.

Reddick had developmental disabilities but lived independently and volunteered with St. Louis ARC, which serves people with disabilities in the region, said Sharon Spurlock, director of family support for the organization.

Reddick won a national award last year for his efforts to educate, train and support others living with disabilities.

Spurlock said Reddick founded a nonprofit organization to work with other agencies to advocate for equality for the disabled.

He frequently made speaking appearances in the region and pushed for better job opportunities and wages for people with disabilities.

She said he also started a website to give other people with disabilities a forum to share their own stories.

“He was an amazing man,” Spurlock said. “That’s what’s so disheartening about all of this. I just feel like there were all kinds of things coming together for him.”