This story has been updated since its original publication.
WALLA WALLA — An autopsy conducted Monday determined that College Place Mayor Rick Newby died of heart arrhythmia.
Newby, 54, died at his home in College Place Sunday afternoon. Funeral arrangements are pending with Herring Groseclose Funeral Home.
Newby had been appointed mayor in March 2009 after former Mayor Ed Ammon moved to Denver. He was elected to his first full term in 2010 and re-elected to a second term in November.