Ex-boyfriend arrested, charged with murder in deaths of 3 in DC row house fire: police [Video]

WASHINGTON – Authorities say they have arrested and charged a man with murder after a row home fire he deliberately set killed three people in southeast D.C.

The fire was reported early Sunday morning in the 3400 block of 23rd Street.

34-year-old Jessica Cunningham and 64-year-old Ronald McKinnon both died at the scene. The third victim, 85-year-old Margaret McKinnon, had originally been rescued from the home by firefighters and was transported with critical injuries. She died Monday at the hospital.

READ MORE: 2 dead, 1 critically injured following house fire in Southeast DC

At a press conference Monday, police said they identified the suspect as 56-year-old Robert Simpson of D.C. They say he was Cunningham’s ex-boyfriend and is believed to have once lived in the home that he set fire to.

Surveillance footage captured Simpson approaching a window of the home at around 5:30 a.m. and causing a flash, after which the fire …