FILE - In this July 6, 2016, file photo, San Diego Police Chief Shelley Zimmerman holds up a information bulletin depicting the suspect in several murders of homeless people in downtown San Diego at a news conference in San Diego. A man injured during a series of attacks on homeless men in San Diego died at a hospital Sunday, July 10, police said. (AP Photo/Lenny Ignelzi, File)

SAN DIEGO - The Latest on a 36-year-old man freed from jail without being charged after his arrest in spate of killings of homeless men (all times local):

4 p.m.

San Diego police say they didn't have enough evidence to prosecute a homeless man who was arrested on suspicion of killing three transients and severely injuring a fourth — including two were set on fire.

Anthony Padgett was released from jail Monday and not charged with any crimes — four days after his arrest gave a sense of relief to the city's homeless population.

Capt. David Nisleit defended the arrest, saying the 36-year-old Padgett resembled a suspect captured on convenience store surveillance video. Police still believe surveillance video shows the suspect.

Police also took into account that Padgett set a sleeping homeless man on fire in 2010 — similar hallmarks to last week's attacks.

1:20 p.m.

Prosecutors say a man who was arrested in connection with a spate of killings of homeless men in San Diego has been freed from jail and has not been charged with any crimes.

The San Diego County district attorney's office said Monday that police did not submit the case for prosecution. It says the investigation continues into the attacks on four homeless men over four days last week — three of whom died.

San Diego police arrested 36-year-old Anthony Padgett on Thursday on suspicion of murder, attempted murder and arson and identified him as the sole suspect in all four attacks.

Police have scheduled a 3 p.m. news conference to discuss Padgett's release.

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12:30 a.m.

A man injured during a series of attacks on homeless men in San Diego died at a hospital — bringing the death toll to three, police said.

Dionicio Derek Vahidy, 23, died Sunday four days after he became the fourth and final victim in the attacks, police said. Vahidy had been in grave condition since Wednesday and had not been expected to survive.

Vahidy was from San Diego and was homeless, police said. He was attacked at an apartment complex downtown, police said. A witness pulled away a burning cloth that the attacker put on him before fleeing.

In the days before the attack on Vahidy, two other men were killed and a third was severely injured. Three victims were sleeping alone, and two were set on fire.

On Thursday, Anthony Padgett, 36, was arrested on suspicion of murder, attempted murder and arson in the attacks.

He has not yet appeared in court, and it's not clear whether he has hired an attorney. Attempts by The Associated Press to reach family members have been unsuccessful.

Padgett was arrested about a block from a trolley station in Chula Vista, the San Diego suburb where he was born.

The violence began July 3, when police found the badly burned remains of Angelo De Nardo between Interstate 5 and train tracks. The 53-year-old died before his body was set on fire.

The next day, officers responding to a 911 call found Manuel Mason, 61, with life-threatening injuries to his upper torso. A few hours later, police discovered the body of Shawn Longley, 41, who bled from the upper torso and died.

Then on Wednesday came the attack on Vahidy.

Padgett committed a nearly identical crime six years ago, admitting to setting a man on fire and leaving him badly burned in a supermarket parking lot in the San Diego suburb of National City.

He said in a note to a judge at the time that he was drunk and high on drugs when he did it and had only meant to scare the victim, who he knew.

In the note, Padgett also called himself a "homeless citizen," asks Jesus to forgive his sins and expresses remorse for the victim, saying, "I'll never be so stupid again."

News from © The Associated Press, 2016