NEW MILFORD — Leonard Sikorski called 911 last September so police could save a 24-year-old woman who was overdosing on heroin in his living room, but what police found in his home that night had him plead guilty to weapons and explosives charges this year.

Sikorski, 60, pleaded guilty to charges of illegal possession and storage of explosives in state Superior Court in Litchfield in July. Then he pleaded guilty to a federal charge — one count of illegal possession of a gun with a wiped serial number — in U.S. District Court in New Haven on Oct. 18.

Sikorski faces a maximum term of five years in prison and a fine of up to $250,000 for his federal charge, according to a U.S. Department of Justice press release. He’ll be sentenced Jan. 13.

Police arrived at Sikorski’s Clearview Drive home the morning of Sept. 24 last year because he told them there was a woman having a “seizure of some sort,” court documents said.

After an ambulance took the 24-year-old to the hospital, police searched the home and found 42 blasting caps, which are devices used to ignite large explosives, in Sikorski’s bedroom, along with some heroin and needles, documents said.

The woman, who police described as overdosing, survived, police said.

New Milford police then charged Sikorski with sale of a controlled substance and possession and storage of explosives, all felonies. He would later plead guilty to only the two explosives charges.

During the NMPD’s investigation, another woman who was at Sikorski’s home the night the 24-year-old overdosed told police she and Sikorski had spent the previous day at two storage lockers Sikorski had in Danbury.

When police searched the Danbury lockers, they found several guns, including a 12-gauge shotgun with its serial numbers scratched off, and 1,500 rounds of ammunition.

Sikorski agreed to surrender all the guns and ammunition to the FBI, the press release said. He also surrendered five pistols and two rifles local police had taken from him in separate traffic stops in Naugatuck and New Milford.

In both his federal and state cases, Sikorski took a plea deal.

“It does not matter if I go to jail. I have nowhere to live anyway,” police said Sikorski told them.