Yes. It’s detailed in Defending the Devil. I posted that part here. A Visual Timeline has a small summary. He was put on suicide watch the morning of the guilty plea and then later on suicide precaution :
May 17-31, 1979: Ted prescribed Ativan for “anxiety” and Limbitrol for “agitated
May 28, 1979: Ted now taking two milligrams Ativan in the morning.
May 31, 1979: Ted takes 2 mg Ativan in the morning. According to a nurse, “He
was depressed and needed to talk to someone” (Nelson 1994, 244). Later in the day
he was placed on suicide watch. Ted rejects guilty plea (which would have saved his
June 1, 1979: “He was extremely agitated with symptoms of depression” (Nelson
1994, 244). A plan is made to take him off Ativan and try other medication. Placed
on suicide precaution.
June 8, 1979: Ativan stopped. Chlorhydrate (sedative, hypnotic) started.