RODEO -- A 73-year-old homeless man died Sunday after he was found severely beaten, and authorities are seeking the public's help in finding the person responsible for the brutal killing.

William Siewert, a transient who frequented unincorporated Rodeo, was found unresponsive but breathing under an overpass along the ¿railroad tracks near the Rodeo Marina on Sunday morning, said Contra Costa County Sheriff's Office spokesman Jimmy Lee.

Deputies were dispatched at 10:37 a.m. to an area near Second Street and Parker Avenue for report of a "man down." When deputies arrived, they found Siewert, who was semiconscious and unresponsive, Lee said.

Siewert was transported by medical helicopter to John Muir Medical Center, ¿Walnut Creek, Lee said. He was later pronounced dead at the hospital.

An autopsy conducted this morning by the Contra Costa County Coroner's Division revealed his cause of death to be blunt force trauma to the head and his manner of death to be a homicide.

Investigators were still trying to determine a motive for the killing; no suspects had been named or arrested as of Monday afternoon, Lee said.

No additional information was released and the killing remained under investigation.

Anyone with any information on this case is asked to call the Sheriff's Office at 925-313-2600. Tips can be emailed to tips@so.cccounty.us or left anonymously on the tip line at 866-846-3592.


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Contact Natalie Neysa Alund at 510-293-2469. Follow her at Twitter.com/nataliealund.