Jackson, Mo (KSDK/AP) -- Clay Waller's son got into a fight outside the courthouse during a lunch break for his father's preliminary hearing.
Witnesses said a man, who police identified as Waller's son, went up to the last person to testify before the break. The person who testified punched J.C. Waller and a fight broke out.
After some time, a group of women broke up the fight and police moved in.
The person who was on the stand was arrested at the scene. Waller's son was not taken into custody at the time, but Jackson police took him to jail later in the day. Both men are being held on suspicion of assault.
Clay Waller, of Jackson, is accused of killing his estranged wife, Jacque, even though her body has never been found. The charges were filed in April in a case that has drawn national attention.
Jacque Waller was 39 when she disappeared on June 1, 2011. Her Honda Pilot was found the following day along Interstate 55.
The couple was in the process of getting a divorce at the time. Their triplets, now 6 years old, are living with Jacque Waller's sister, Cheryl Brenneke.
Clay Waller pleaded guilty last year to threatening Brenneke over the Internet and is serving a five-year sentence.
Information from the Associated Press contributed to this report.