A man is believed to have killed his wife and two daughters before drowning himself at the family's Bay Terraces home, a source told NBCSanDiego's Tony Shin.
The source, who spoke on the condition of anonymity, said Alfredo Pimienta, 44, left a suicide note inside the residence at 162 Parkcreek Ct.
Alfredo was depressed, in part because the family was struggling financially, the source said.
Alfredo was found drowned with a heavy object anchored to him in the house's backyard swimming pool, the source said.
He and his wife, Georgina, 38, and two daughters, Priscilla, 17, and Emily, 9, were discovered dead about 6:40 a.m.
His children were also found in the swimming pool, and his wife was found in a bath tub, San Diego police said.
Investigators announced Tuesday afternoon the deaths are being investigated as a murder-suicide. The causes of the deaths have not been officially determined, police said in a release.