James Lewis, left, appears in October 2007 on “The Cambridge Rag” cable access television show with host Roger Nicholson. Lewis, a suspect in seven 1982 Tylenol poison deaths, is appearing on the show again Sunday.

James Lewis, a prime suspect in the unsolved 1982 Tylenol poisonings, is set to appear Sunday on “The Cambridge Rag,” the cable-access call-in interview show run by Roger Nicholson.

This is remarkable timing. Lewis and his wife, LeAnn, are reported to have given DNA evidence Wednesday to federal investigators acting on a subpoena from officials in Chicago, where the seven Tylenol-related deaths occurred — the first action on the case since February, when Lewis’ apartment and storage locker were searched and physical evidence taken away.

But contacted today since appearing in a Globe and Mail article and a radio interview with law expert Bill Handel, Nicholson said Lewis was scheduled for his show to talk about a novel he released electronically Jan. 1 called “Poison! The Doctor’s Dilemma.”

The live show is at 8 p.m. on Cambridge Community Television’s Channel 9. Nicholson said he is bound to talking about the novel.

Nicholson is in media demand because he has interviewed Lewis before, in October 2007, and asked him directly about the killings. The inteview is in two parts on YouTube. Click here to see Part 1; and here to see Part 2.

Nicholson and Lewis were neighbors; the suspect moved to Cambridge in 1995 when he was released after serving 13 years in prison, mainly on an extortion charge related to the Tylenol case; although he had sent letters to Johnson & Johnson, the makers of Tylenol, suggesting he had poisoned the pills, he told police the letter was intended to frame someone else for the crime.