Can you imagine what the legal expenses would have been to respond to both civil suits? Few could ever manage that. The State knew it.
Of course the prosecutor knew it and so did Jason's attorney and so did the Judge and so did the attorney who filed it. The Judge not only knew he was a suspect, a police detective testified he was the killer in the civil case. It would be impossible to defend something like that. The intent of the lawsuit was malicious.
He had not been indicted, not named a suspect or person of interest AND Michelle had a WILL. I think THAT is the reason his attorney, Mr. Smith, advised him to not respond.
JMO