pierce in tunbridge wells in kent. the admission cons subject to the issue of diminished responsibility. he will stand trial. that trial is due to begin on november the first. it s emerged at the inquest for the four men murdered by the serial killer stephen part by the serial killer stephen port that he was identified early on in the police investigation into the killings as a significant witness . the four young men were murdered by stephen port in 201a and 2015 they were killed by fatal doses of a date rape drug. inquests are now examining whether the police made mistakes our home affairs correspondent daniel sandford has been listening to the inquests, and we can speak to him now. explain more about what we learned today. explain more about what we learned toda . . g , explain more about what we learned toda. . , explain more about what we learned toda. , ., today. that jerry has been hearing that the first today. that jerry has been hearing that the first step today. that