ROCKVILLE, Md. — A friend of a Maryland man charged with killing his estranged wife and two other people said he saw the couple as recently as three weeks ago and was not aware they had any troubles.

Gary Cochran of Sterling, Va., said in a telephone interview Sunday evening that Eulalio Tordil of Adelphi was ‘‘always smiling and very polite,’’ and he was stunned that the federal police officer is accused of a two-day shooting spree in suburban Maryland parking lots.

Along with the three fatalities, three other people were wounded in the shootings.

‘‘He was a very quiet person, very soft-spoken,’’ Cochran said of Tordil, who attended high school with his wife. ‘‘We’re shocked because we can’t imagine this is the person we invited into our home.’’

Tordil, 62, is scheduled to make an initial court appearance Monday in Rockville, a suburb near the nation’s capital. He faces charges including first-degree murder.

Police said the shootings began Thursday when Tordil fatally shot Gladys Tordil, a chemistry teacher, in a high-school parking lot. A bystander was wounded.

The shootings continued Friday at two different mall parking lots. At the first, authorities said, one man was killed and his friend was wounded while coming to the aid of a woman, who also was wounded. At the second, a woman was shot and killed in her car.

Police said late Saturday that the shootings on Friday were likely botched carjackings. They also identified those who died from Friday’s shootings as Malcom Winffel, 45, of Boyds, and Claudina Molina, 65, of Silver Spring.

Associated Press