Police arrested Marez at 10 p.m. Tuesday after spotting him get off a bus in West Los Angeles. He was booked on suspicion of murder into the Los Angeles County Jail with bail set at $1 million. Prosecutors filed murder charges against him yesterday. At the time of Marez’s arrest on Tuesday, he was out on bail in a case from July. He was due to appear in a Van Nuys courtroom yesterday to face charges of driving without the owner’s consent, receiving stolen property, and narcotics possession, according to the court. A warrant was issued for his arrest when he did not show up in that case because the court was apparently not aware that he was already in custody in connection with the murder case. ———————————————– For the latest news and observations on crime in Los Angeles and the San Fernando Valley, check out the Daily News’ crime blog by clicking here. NORTHRIDGE – The second suspect wanted in the grisly park stabbing of a 33-year-old homeless man has been arrested, caught camping on a beach in Santa Barbara, police said. Justin Thalheimer, 18, of Northridge, was arrested after a short foot chase along the beach in Isla Vista, tackled by a University of California at Santa Barbara police corporal who had been notified to be on the lookout for Thalheimer, who was wanted in connection with the murder of Daniel Edward Koch, who was stabbed sometime late Aug. 25 or early Aug. 26. The corporal, Dan Wilson, was walking the beat near campus last night about 7 when he asked two teens whether they had seen a man who fit Thalheimer’s description camping on the beach. The teens initially told the officer they hadn’t seen him, went away, and then returned later to say they had seen him, said UCSB Police Capt. Cathy Farley. He had been seen camping in a multi-colored tent near a bluff on the beach, Farley said. “It was a I-think-I-got-LAPD’s-man’ moment,” Farley said. “It’s excellent, basic police work.” Thalheimer was held in Santa Barbara custody until L.A. police arrive to pick him up and bring him back to L.A. County custody. He was being held without bail in the Los Angeles County Jail. He faces a murder charge in connection with the death of Koch, who was stabbed repeatedly at Limekiln Canyon Park in Porter Ranch. His bloodied was found face down in a creek about noontime on Aug. 26. A second suspect, Quinn Alexander Marez, also 18, from Northridge was arrested in connection with the slaying on Tuesday as he was getting off a bus in West Los Angeles, police said. Police say Marez and Thalheimer knew Koch and had been drinking with him when an argument broke out and the stabbing occurred. In a twist, Marez was arrested on the night of Aug. 26 on a charge of possession of a heroin needle at his Northridge home, but was released on a written promise to appear in court on that misdemeanor charge. Police said that when he was released on that charge, Marez was a “person of interest” in the murder investigation, although they wouldn’t give specifics about the time line. At some point, they said they had witnesses who could identify the men as suspects.