Strange German deaths

Sounds rather like some murder suicide by crossbow in Germany.   Also sounds like cult-ish people involved?:

A hotel guest said the man had a long white beard and the women were dressed in black, and described them as "strange".

On arrival on Friday evening they simply wished other guests a "good evening", then went upstairs to their second-floor room with bottles of water and Coca-Cola, said the guest, quoted by Merkur.

In Wittingen a neighbour quoted by Merkur described the 30-year-old woman as "always a bit odd - always dressed in black, sort of gothic".