This question has been addressed in 1 Texas court opinion:
COA14 — February 24, 2026
In a negligence lawsuit arising from a workplace accident, the defendants moved to designate the plaintiff's employer as a Responsible Third Party (RTP). The plaintiff objected, arguing that the employer's worker's compensation immunity barred the designation and that the defendants failed to plead sufficient facts. The trial court denied the motion. On mandamus review, the Fourteenth Court of Appeals analyzed Texas Civil Practice and Remedies Code Chapter 33 and the 'fair notice' pleading standard. The court held that because the motion was timely filed (more than 60 days before trial) and provided sufficient notice of the allegations, the trial court had a ministerial duty to grant it. The court further clarified that statutory immunity does not prevent a party from being included in a proportionate responsibility jury charge.
Litigation Takeaway
“In litigation involving interspousal torts or fraud on the community, always look to designate responsible third parties (like paramours or financial advisors) to dilute your client's percentage of fault. Trial courts have almost no discretion to deny these motions if they are filed 60 days before trial and meet the minimal 'fair notice' pleading standard, even if the third party has a statutory immunity against being sued directly.”