Delaware Courthouse Shooting Update: Son, wife of alleged gunman are also suspects in two killings, report says

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

Police say that Thomas Matusiewicz, 68, fatally shot Christine Belford and her friend, Laura Mulford, Monday at the New Castle County Courthouse after Belford appeared for a hearing in her lawsuit against the family. Matusiewicz then killed himself.

Belford and her ex-spouse, David Matusiewicz, were due in court for a child support hearing following a long, bitter custody battle, according to CBS Philly.

According to the affidavit, Matusiewicz, his wife and his son are "suspected of intentionally and knowingly participating in a murder." The affadavit 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. The lawyer was not present at the courthouse at the time of the shooting, the station reports.

Lenore Matusiewicz, Thomas Matusiewicz's 67-year-old widow, says she had no idea he was planning the violent rampage.

She told The Associated Press on Thursday that she told her husband, who was a former New Jersey police officer who often carried a pistol, to leave his guns at their Texas home before they drove to Delaware last week.

Mrs. Matusiewicz also said her son, David, did not know his father brought a gun to Delaware.

David Matusiewicz, 45, is scheduled to appear in federal court today for a detention hearing on an alleged probation violation. He was on probation after kidnapping his and Belford's three daughters in 2007, shortly after the couple divorced, CBS Philly reports.

Complete coverage of the Delaware Courthouse Shooting on Crimesider