Two cousins were found shot to death in a silver Lexus and a 60-year-old man was found dead near a tire store in two separate slayings Monday in Prince George’s County, authorities said.

The more recent incident occurred about 11:30 p.m. Officers were sent to the 1300 block of Rollins Avenue in Capitol Heights on a report of gunfire, said Cpl. Mike Rodriguez, a county police spokesman. They found two men dead inside the Lexus from apparent gunshot wounds, Rodriguez said.

Lonnie Bryant, 61, who lives in a townhouse off Rollins Avenue, said he heard what sounded like six gunshots.

“It sounded like it was an automatic weapon,” said Bryant, a retired military police officer.

Rodriguez identified the men as Anthony S. McKelvin, 28, of Suitland and Sean O. Ellis, 24, of District Heights.

A law enforcement source said there was evidence of bleach and gasoline, as if the suspect or suspects intended to burn the car and cover up the shooting.

Cynthia McKelvin-Wheeler, McKelvin’s mother, said her son wrote raps and hoped to become a cement mason. He had a 7-year-old son and a 3-year-old daughter who live with their mother in Pennsylvania, McKelvin-Wheeler said.

“He was always happy,” she said.

Police were tipped to the first incident about 8:30 a.m. Monday, when a caller reported a man lying unconscious in the 900 block of Chillum Road in the Chillum area. He was pronounced dead at the scene. Another law enforcement source said he had what appeared to be a stab wound to his stomach.

Police identified the man as Edward J. Scott, 60.

The violence brought the county’s homicide total for the year to 51, including justified killings and fatal police shootings.