The Grand Ayatollah Khamenei answered a question about Qadha Salaat for a person who is passed away.
Question: Can Qadha Salaat for a person who is passed away be performed by a few people, for example one to perform Dhuhr Salaat, and one Asr, and the other Maghrib; of course by observing time intervals?
The Grand Ayatollah Khamenei: There is no problem.
Source: khamenei.ir