An 80-year-old Calvert County man, who police said shot his wife in the back last week then refused to come out of his home for six hours, was charged Tuesday with first-degree assault and reckless endangerment.

The charges in Calvert against James H. Clark, of Dowell, come as Charles County sheriff's office detectives continue to investigate the shooting of two men in a trailer park in Waldorf that occurred just as Clark was apprehended on the night of Jan. 8. Charles detectives have yet to make an arrest.

Clark, who uses a wheelchair, is accused of shooting his wife of more than 50 years, 80-year-old Mable Clark, four times in the back during an argument.

The shots hit Mable Clark as she was turning to escape the room, and she then called police after locking herself in her bedroom, said Detective Sgt. Greg Cameron of the Maryland State Police.

Three state troopers and two Calvert County sheriff's deputies pulled her out of a window and carried her to safety, Cameron said.

"They had to take some kind of action to get her treated," Cameron said.

Mable Clark was listed Tuesday in stable condition at Prince George's Hospital Center.

Her husband was apprehended after a tense, six-hour standoff with police, but he was not charged until Tuesday because he was undergoing tests and receiving medical treatment at Calvert Memorial Hospital, Cameron said.

He was arrested about 3:30 p.m. Tuesday after being discharged from the hospital and is now being held at the Calvert County Detention Center on $50,000 bond.

Deputy State's Attorney Laura L. Martin said Clark has not been charged with more serious counts such as attempted murder because detectives have not been able to interview him or his wife. The case will be heard by a grand jury next week.

Dana Clark, the suspect's son, said his father is a diabetic with a host of other medical problems and had been acting erratically of late.

"My father, he has his good days and his bad days," Dana Clark said.

In the Charles County shooting, sheriff's officials said the motive was robbery. The gunman broke into the mobile home of a 43-year-old man in Gillespie trailer park in Waldorf, robbed him, then shot him, sheriff's officials said.

A 63-year-old man from Georgia then walked into the house and the suspect shot him as well, sheriff's officials said. The older man is in critical condition at Southern Maryland Hospital, while the 43-year-old man was treated and released a few hours after being shot. The sheriff's office declined to identify either victim.