Archibald Seth Armstrong is a fictional character from the British ITV soap opera Emmerdale, played by Stan Richards from 1978 until 2004.

Richards hoped to return to the serial full-time, but his death in February 2005 prevented this and producers opted to kill off the character as a result, with Seth dying on the flight over from Australia back to Leeds and the village that October.

An amusing postscript occurred in 1991, when Alan Turner and Henry Wilks (Arthur Pentelow) read Amos Brearly's (Ronald Magill) diaries and discovered that Seth was, in fact, an illegitimate descendant of the Verney family.

However, any possible claims to ownership of Home Farm was obscured by NY's purchase and subsequent sale to Frank Tate (Norman Bowler).

Alan feared that Seth had been killed and felt guilty as he had thrown him out of the Woolpack just before the crash happened, but he turned out to be unharmed.

Things got worse for Seth in September when he won money on the horses but was later mugged by some young girls and briefly developed agoraphobia.

Later that year he celebrated his 74th birthday which the village had thought was his 75th and threw him a party in The Woolpack, however he decided not to tell them so as not to hurt their feelings.

[4] Richards was keen to reprise his role, but on 11 February 2005, he died of emphysema and several months later, out of respect for the actor, an off-screen death for the character occurred.

Seth died on 30 October 2005 from a heart attack after having been ill for a while in Australia, whilst on the plane flying back to England.

After she catches Caleb lying to her, she tells him that Seth Armstrong is actually a fake businessman she made up to trick him, but in fact is the former gamekeeper at Home Farm and one of her closest friends.