Al-Nadr ibn Suwayd, from Asim ibn Humayd, said:
I asked Imam عليه السلام about touching a dead body - does it require ghusl? Imam عليه السلام said: "If you touch its body after it has cooled, then perform ghusl."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 1, p. 454