Connecticut state police are investigating the death of a 26-year-old man who died after a Hartford police officer used a Taser to subdue him when he allegedly became combative during a medical assistance call.

Police said a mobile crisis team and EMS personnel responded to a home on Kelsey Street at about 8:30 p.m. Friday for reported a medical-psychological disturbance involving a 400-pound person.

They said Matthew Russo became violent with the emergency responders and was struck with the electric stun gun, then given a sedative.

Police said Russo began to have difficulty breathing and was given immediate medical aid. He was taken to Hartford Hospital where he was pronounced dead.

State police took over the investigation early Saturday. An autopsy is being conducted to determine the cause and manner of Russo's death.