"The caller said that his 40-year-old son who has psychological issues and was not taking his medication had threatened to cut the fathers head off," said Lt. Jack Fitzpatrick, of the Suffolk County Police Department.
That's what brought police to the apartment complex in Deer Park Wednesday morning.
"All the police men running that way, guys without uniforms even, and they had the bullet proof vests on, a lady with a bullet proof vest," said Maie Valma, a Deer Park resident.
"When police arrived they encountered a 40-year-old male outside of the apartment armed with a knife. A foot pursuit ensued throughout the apartment complex ending up within the apartment itself, and that's where the man was shot once in the chest by police," Fitzpatrick said.
It's unclear if the man lunged at police or threatened them with the knife.
No officers were injured.
"He's a good kid. He's handicapped. He doesn't know how to be bad. He knows how to throw out the garbage. He doesn't talk to anyone or nothing, unless you say hello to him," a neighbor said.