It’s another language thing. I hear it all the time. It seems excessive:
“I love (him/her) to death”
or, more commonly up here in Vermont:
“I love him/her right to death.”
Interestingly, there’s often a “BUT” thrown in there, as in:
I love my son right to death but, man, his feet really stink”
She’s got her problems and all, but I can’t help myself; I just love her to death.
Please don’t. Try to rein yourself in. Loving someone to death is counter-productive. Better yet, try to find some other, more sensible superlative, okay? Thanks.