Pico Rivera, Calif. ? A man killed five of his children by lighting a charcoal grill in their living room and filling the home with deadly carbon monoxide fumes, authorities said Thursday.

Prosecutors said murder charges will be sought against Adair Garcia. Sheriff’s Lt. Don Bear said investigators are “absolutely certain” Garcia intended to asphyxiate his six children ages 2 to 10 and himself.

The sixth child, a 9-year-old girl, remained hospitalized. Her condition was not immediately available, but Bear said she was expected to survive.

Garcia was in stable condition at Presbyterian Intercommunity Hospital in Whittier, a hospital spokeswoman said. “As soon as he’s able, he’ll be transported to the jail ward,” Bear said.

Garcia, 30, lit the grill and placed it in the house Wednesday, police said. Authorities initially believed the grill may have been used to warm the house, about 10 miles southeast of Los Angeles. But an examination of the scene showed working heaters, leading investigators to suspect Garcia.

The children’s distraught mother, Adriana Ibeth Arreola, had to be restrained by deputies when she arrived at the scene. She had been living at another location for about a week.