Richard Webster has resigned as Neath coach after only six months at The Gnoll.
The former Wales flanker, who is also Wales Under-20 coach, has stepped down because work commitments, according to the club.
Webster worked under director of rugby Patrick Horgan.
Head coach Patrick Horgan said: "We are very sorry to lose Richard at this stage. He is a forthright character in the true Neath mould."
Webster, 44, resigned as Swansea coach in April after four successful years at the helm.
He returned to St Helen's on Saturday as Neath were held to a 33-33 draw against his former club.
Horgan added: "He has an awful lot to offer in coaching terms but I can sympathise with him. He has other commitments and these are tough times for the building trade in which he works.
"We will miss him as he got on well with everyone at Neath - on the field and off - and we wish him well. Who knows ? One day, he may return and, if so, he will be welcomed back.
"It was a pity that he didn't sign off with the win over Swansea that we richly deserved."
Neath said they had no immediate plans to appoint Webster's successor.