The only former Enron executive to go straight to prison after pleading guilty to a crime testified Tuesday that former company chiefs Kenneth Lay and Jeffrey Skilling lied about Enron’s strength in 2001 when it was failing.

“It was weak,” Ben Glisan Jr., on furlough from prison, said of Enron’s financial state by the time Skilling resigned as chief executive officer in August 2001 and Lay hurriedly resumed the role he had ceded to his No. 2 just six months earlier.