NEW : Neither ruled out definitively the possibility that Williams could have somehow done it alone . Police chief Evans ` ` unreservedly '' to spy 's family for them to act quickly . Gareth Evans was poisoned or drowned in the bag in which he was locked , coroner says . The bag containing his naked body was put into a bath by an unknown person , coroner rules . His family calls for an investigation into the secret services ' role in the investigation .
NEW : Police chief Evans ` ` unreservedly '' to spy 's family for them to act quickly . Gareth Evans was poisoned or drowned in the bag in which he was locked , coroner says . The bag containing his naked body was put into a bath by an unknown person , coroner rules . His family calls for an investigation into the secret services ' role in the investigation .