CARMICHAEL (CBS13) – The Sacramento County Coroner’s Office has released the cause of death for the Carmichael man who died Sunday after being struck by a hit-and-run driver last month.

Harison Long-Randall, 21, of Grass Valley died from complications of multiple blunt force trauma Sunday at Mercy San Juan Medical Center.

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Paul Walden (credit: Sacramento County Sheriff’s Dept.)

Long-Randall and his girlfriend Gemily West, 23, were walking her four Australian cattle show dogs on the night of July 16 when they were struck by a Nissan Maxima at the intersection of Garfield Avenue and Engle Road. All four dogs were killed.

Long-Randall lost his leg in the accident but was recovering in the hospital when his condition suddenly took a drastic turn for the worse on Sunday.

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West suffered a badly injured leg in the accident but is recovering at home after being released from the hospital.

The California Highway Patrol arrested Paul Walden, 31, a few days after the accident. Walden now may face additional charges related to Long-Randall’s death.

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Walden is being held in the Sacramento County Jail without bail. He’s scheduled to appear in court again Aug. 8.