Update, 10:15 a.m.:
San Francisco authorities have arrested a man they say may be connected to a series of arson fires in the city's Castro and Noe Valley neighborhoods. The suspect is a man convicted last year in the 2011 death of a sexual partner who was strangled and then burned.
San Francisco police say they took David Munoz Diaz into custody about 8:15 p.m. Wednesday outside his home on 18th Street near Noe Street. A source close to the investigation said the arrest came after investigators obtained video evidence from the scene of a recent arson fire.
Diaz is being held at San Francisco County Jail facing three felony charges, including first-degree arson, possession of arson materials and burglary.
Officer Grace Gatpandan, an SFPD spokeswoman, said those charges stem from a fire near Diaz's home early last Saturday morning. She said investigators are “exploring the possibility” Diaz is linked to other fires.