In exclusive footage obtained by “True Crime News,””Christopher Austin admits to investigators that he helped his relative, Robert Baker, fatally stab Fabio Sementilli in his Los Angeles-area home. Austin pleaded guilty to charges and will testify on behalf of the prosecution at Sementilli’s wife’s trial. Officials allege Sementilli’s wife, Monica Sementilli, orchestrated a plot to kill her husband and collect his insurance money.