D.C. police arrested a Southeast Washington man for the fatal stabbing of a 48-year-old man in the Foggy Bottom neighborhood Tuesday afternoon and said he was responsible for another knife attack earlier that day in downtown.

Authorities charged 51-year-old Joseph Melton with first-degree murder while armed in the killing of Kevin Chamberlain, of no fixed address, police said in a statement. Officers found Chamberlain in the 2400 block of Virginia Avenue NW about 2:35 p.m. Tuesday, and medics took him to a hospital, where he was later pronounced dead, police said.

Investigators also charged Melton with assault with intent to kill (knife) in an attack that happened in front of the Department of Veterans Affairs in the 800 block of Vermont Avenue NW about 12:35 p.m. Tuesday, police said.

The victim in that attack suffered a stab wound to the abdomen and lost consciousness while talking to a responding police officer, according to a police report. Medics took the victim to a hospital.

Authorities did not provide a motive in either attack.