Marnicus Lockhard received the maximum eight years for second degree manslaughter.
The body of 19-year-old Tiairra Jo Garcia has yet to be found. Prosecutors say Lockhard dumped her body in a remote area of Mount Rainier National park.
After Lockhard apologized today, his attorneys said Lockhard will cooperate with Pasco police still searching for the woman's body.
Garcia's mother says eight years in prison isn't enough, but Donna Garcia says she just wants to get her daughter back.
Superior Court Judge Bruce Spanner says he's distressed that Lockhard has waited until now to help find the woman's body.