Some sort of mental illness
I thought I heard it can be triggered by grief.
One my Daily dog walk I pass a 1970s 3 bed detached house that for years has looked run down.
The garden is clear, but through the patio windows the stuff is shoulder high.
The owner lost his wife years back.
He doesn't use central heating but has calor gas.
He had a fire in the night, neighbours rescued him, he was a bit burnt.
Now the house has been gutted by contractors, for got in roof.
I can't decide whether he would've been covered by house insurance or not