23-year-old murder
... that, in 2009, Los Angeles police detectives investigating a 23-year-old murder found that the killer was a fellow detective?
... that, in 2009, <a href="./Los_Angeles_Police_Department" id="mwCGA" rel="mw:WikiLink" title="Los Angeles Police Department">Los Angeles police</a> detectives investigating a <b id="mwCGE"><a href="./Murder_of_Sherri_Rasmussen" id="mwCGI" rel="mw:WikiLink" title="Murder of Sherri Rasmussen">23-year-old murder</a></b> found that the killer was a fellow detective?