Q. Out of curiosity, if someone‘s death sentence will be carried out during sefira, does he count with a bracha?

A. See prior question. Chida (Avodas Hakodesh 7: 217) and others maintain that if one omitted counting one day of sefira, retroactively all the brochos recited would be considered in vain Accordingly it would befit that someone who knows that he won’t be able to finish the sefira, or will miss one day due to surgery or similar irrepressible situation, should listen to someone else’s brocho. However most Poskim disagree with the notion that the blessings would be retroactively lebatalah , since at that time he was still counting properly. Therefore one can recite the brocho of sefira until the day he misses. (Kinas Sofrim, Piskey Teshuvos 489: 22, Mekadesh Yisroel – Sefira 27, Minchas Oviv et. al.)
Horav Shlomo Miller’s Shlit’a opinion is similar.

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit”a.