The affidavit filed in D.C. Superior Court says that after several minutes, the alleged shooter pulled a firearm from his waistband, as Monroe sat on the bench, both arms extended outward.

The suspected gunman “steps forward and took aim” and fired a single shot, the affidavit says. “The glass panel behind the decedent shattered and the decedent fell to the ground,” the affidavit says.

Police said they arrested Deonte Vondell Spicer, 36, of Northwest Washington, and charged him with first-degree murder. No motive is listed in court documents. His attorney did not respond to a request for comment.

Monroe, who lived in Arlington, Va., grew up with his grandparents and graduated from Edison High School in Fairfax County, according to his grandfather Rickey Cruse, who lives in Virginia. Monroe played football and basketball at Edison.

“He was a good kid,” Cruse said. “He never had a confrontation with anybody. He went to school, to work, and he wanted to be a basketball player.”

Dip Metress, head coach of the Jaguars basketball team at Augusta University in Georgia, said he recruited Monroe and offered him a scholarship. Monroe attended the university from 2015 to 2019 and graduated with a degree in communication, according to Metress.

The coach said the team twice made it to the Division 2 NCAA tournament with Monroe, who was playing forward in his senior year. In January 2019, Monroe scored his 1,000th point in a blowout victory. A profile of Monroe on the university’s website says he played in all 34 games his senior year, starting in 33 of them, and was sixth all-time in three-pointers.

Metress called Monroe’s death “a real shame” and described him as “very competitive” and a mentor to younger players.

He said Monroe wanted to play professionally and had talked about trying to play in Europe. After college, Metress said, Monroe returned to Virginia. “He was the typical guy in college,” his coach said. “His basketball career is over. You just try to figure out what comes next.”

Cruse, his 71-year-old grandfather, said Monroe worked for a political campaign after college and later had jobs in security and at an manufacturing plant in Virginia. His LinkedIn page lists his security job at a Virginia hospital. Cruse said he had not seen his grandson since Dec. 3 and did not know why he was at the Metro station.

After the shooting, the police affidavit says, Spicer walked back to the bus stop where he had gotten off earlier and, along with his dog, boarded another bus. Police said in the affidavit that the bus then traveled past the wounded Monroe as it headed to another stop, where Spicer got off.

Police said they got a tip in the case from an anonymous caller who recognized Spicer from a photo made public by police from the surveillance video. Police said that led them to Spicer’s apartment in Northwest Washington.

In another case, police said on Thursday, they arrested Tremon Jackson, 20, and charged him with second-degree murder in the Nov. 4 shooting of Charles Towles, 22, of Southeast Washington. Efforts to reach Jackson’s attorney were not successful.

Towles was shot about 3:45 p.m. outside an apartment complex in the 1400 block of L Street SE, about three blocks south of the Potomac Avenue Metro station.

An arrest affidavit says two men confronted Towles in what appeared to be a dispute among people who knew one another. The affidavit says one of the men was fighting with Towles when the second man shot him five times.

Police said both men who confronted Towles had guns, but the affidavit did not say whether Jackson was the person who fired. The other man is being sought. The nature of the dispute was not described.