The Marine reservist was killed by a roadside bomb in southern Afghanistan.
Cottle, of Yorba Linda, joined the LAPD in 1990 and began with SWAT six years later. Cottle is the first active LAPD officer to be killed in Afghanistan.
Cottle and Lance Cpl. Rick Centanni, 19, also of Yorba Linda, were traveling with other Marines in the Marja region March, when their armored vehicle hit an improvised explosive device, killing the two men and seriously wounding two other marines.
Cottle's private service will be held Tuesday at the Cathedral of Our Lady of Angels in downtown Los Angeles.
He is survived by his wife Emily, a naval officer and their 9-month-old daughter. Cottle is a veteran of two tours in Iraq and will be buried at Arlington National Cemetery in Virginia.