SOUTH PASADENA — Authorities Thursday released the name of a 51-year-old man found dead in his South Pasadena home earlier this week, though his cause of death remained under investigation.

Miguel E. Santamaria was found by a friend unresponsive and bloody just after noon Monday at his home in the 1600 block of Amberwood Drive, according to South Pasadena police and Los Angeles County coroner’s officials.

It was not immediately clear how Santamaria died, so sheriff’s homicide detectives and coroner’s officials were summoned to conduct an investigation, police said.

An autopsy had not been completed Thursday, coroner’s officials said.