HOULTON, Maine — Twenty-five-year-old Michael C. Shain of Houlton was arrested on Aug. 10 on charges of domestic assault and child endangerment after police were called to a Reservoir Hill Road house the day before for a report of a drug overdose.

Houlton Police Chief Butch Asselin said Wednesday afternoon that an ambulance crew found an unconscious 27-year-old woman at the house, who they then transported to Houlton Regional Hospital.

Four hours later, the Houlton Police Department received a call from the victim’s father requesting to see a law enforcement officer at the hospital.

Officer Theron Bickford met with the father and later was assisted by Detective Kris Calaman, who contacted Asselin at approximately 7:30 p.m. and told him the victim had significant injuries, described as bruising in several locations on her body and minor injuries to her mouth. He also said that the victim may have had a partially collapsed lung.

The victim was placed in a drug-induced coma and later was taken by ambulance to Maine Medical Center in Portland.

Police said that Shain was allegedly at the residence for several hours while the victim was unconscious.

A mutual friend visited the residence at Shain’s request and urged him to call 911. Shain did not, and the friend left for fear that if police were called, they would arrest him on outstanding warrants, police said.

A concerned relative of the victim happened to visit the home and, finding the woman unconscious, called for help. Shain was not present upon the relative’s arrival, but the victim’s 4-year-old twin daughters were inside the home, police said.

Asselin said the 4-year-olds told relatives that Shain forced pills into the victim’s mouth while she was unconscious. The victim reportedly was choking on the medication as it was being placed in her mouth. Little, if any, of the medication was believed to have been ingested, police said.

The victim was unconscious for several hours before the ambulance crews’ arrival, Asselin said.

Pills were scattered on the rug in the area where the victim was found, police said.

The victim regained consciousness on Saturday, Aug. 11, and has been released from the hospital. She is expected to recover.

Shain was arrested at his residence the next day.

The chief said Shain had been arrested in April 2012 for domestic assault involving the same woman. He pleaded guilty to the offense on May 29 and was sentenced to 9 months in jail with all but 30 days suspended, and was placed on probation for a year. Because of the prior conviction for domestic assault, the new offense is elevated to a Class C crime, punishable by up to five years in prison and a fine of up to $5,000.

Shain was being held at the Aroostook County Jail in Houlton on Wednesday, pending arraignment on this charge and for violating his probation. A protection from abuse order, on behalf of the children, was filed against Shain.

The Department of Health and Human Services also was involved in the investigation, Asselin said on Wednesday.