DOVER, Del. (AP) — An affidavit to search of the home of a Texas man who killed his former daughter-in-law at a Delaware courthouse says the man’s son and wife are also suspects in her death.

Thomas Matusiewicz shot Christine Belford and her friend Monday at the New Castle County Courthouse after Belford appeared for a hearing in her lawsuit against the family. He then killed himself.

According to the affidavit, Matusiewicz, his wife and his son are “suspected of intentionally and knowingly participating in a murder.” It describes video that shows Matusiewicz and his son hugging in the courthouse lobby.

After the son leaves, Matusiewicz waits for his victims, kills them and wounds two officers before shooting himself. Found on his body were two handwritten death certificates for Belford and her lawyer.

(© Copyright 2013 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)