Why isn't Isak Hellman's Yahrzeit Exact?

We do not know the exact date of death of Isak Hellman. According to Jewish tradition, if the exact date of death is not known, the yahrzeit of a person can be observed on any day, as long as it is that same day every year. Since that is the case, we observe the yahrzeit of Isak Hellman on 13 Tammuz. If you know the exact date of death of Isak Hellman, contact us via the contact page. Be sure to include the url: https://eachofushasaname.org/person/1977/Isak_Hellman.html