A Connecticut man who was shot and killed by the local police at the start of the Memorial Day weekend was identified Sunday by state authorities as a 75-year-old Army veteran and founder of a military museum in Danbury.

The authorities said the man, John Valluzzo, was armed with a handgun when officers from the Ridgefield Police Department confronted him in the front yard of his property on Friday just after 5:15 p.m. The officers had responded to a call of a domestic dispute at that address, 423 Ridgebury Road in Ridgefield, along a verdant stretch of sizable homes.

“Ridgefield officers order the subject to disarm and put down his weapon,” according to a statement by the Connecticut State Police, whose detectives are investigating the shooting. Mr. Valluzzo did not comply with the officers’ instructions, the police said. “He raised the weapon toward the officers and caused a Ridgefield officer to discharge his service weapon, striking the male subject,” the police said. Mr. Valluzzo died a short time later at Danbury Hospital....