Urwah (may Allah have mercy on him) states, among the names of those who were martyred on the day of the Bridge of al-Mada'in alongside Sayyiduna Sa'd bin Abi Waqqas (may Allah be pleased with him), from the Ansar, then from Banu Amr bin Mabdhul: Tha'labah bin Amr bin Mihsan.
Hadith Referenceالمعجم الكبير للطبراني / باب الثاء / 1382