Q. Could an onen (one who lost a close relative, before burial) be the mohel at a bris, if no one else is available?
A. Chassam Soffer (C.M. 39) maintains that if the body of the deceased has already been transferred to the Chevra Kaddisha, it is permitted if no one else is available and the burial cannot be done before.
Yehuda Yaaleh (356), writes that in such a case the father or the sandak should recite the needed brochos.
Horav Shlomo Miller’s Shlit’a opinion is similar.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a