Pennsylvania father seeks answers after son dies following alleged game of tag.

 Pennsylvania father seeks answers after son dies following alleged game of tag.

Pennsylvania father seeks answers after son dies following alleged game of tag

Pennsylvania father is seeking answers after his teen son died on Friday night after allegedly being chased by other teens who had come to his home and asked him to play a game of tag, the father told ABC News.

Orville Johnson told ABC News that his son, Justin Johnson, had sickle cell disease and he understood that because of his condition, the teen could not run or exert too much energy because it could "cost him his life if he has to do anything like that.He was so special," Johnson said of his son, who would have turned 17 on Tuesday. "I'd do everything in my life to make sure he can live a good life, and they took him away from me."

The Dauphin County coroner ruled Justin Johnson died of natural causes from complications of sickle cell disease, also listing cardiomyopathy as a significant contributor, local ABC affiliate WHTM reported Tuesday.

Around 8:20 p.m. on Friday, the16-year-old was at home in Harrisburg, PA, when a group of four teenagers went over to his house. 

As one of the teens rang the doorbell holding what appears to be a toy gun, another teen called Johnson, asking him to "come outside," home security videos provided to ABC News show.

During the call and while standing in Johnson’s lawn, the teen tells Johnson, "Justin, I see you in the window,' and to "come out."

Orville Johnson was notified by the home security system that someone was outside the door, which prompted him to let his son know someone was at the door, Orville told ABC News.Justin] called me and said "Dad, they didn't want to chase nobody but me and I had to run fast, fast away to come home, run away from them and come home," Johnson said.

About an hour later, Orville Johnson finished work and called his son, but the calls went unanswered. 

Upon getting home about 30 minutes later, he noticed his son's phone on the counter. 

As he stretched to grab the phone, he noticed Justin on his stomach on the ground.