Person I bought my timeshare is diseased and I can’t get rid of it.

Deceased! Not diseased!

I bought my timeshare over 18 years ago with a work colleague. We stopped being friends and I paid it off. I am trying to give it back to worldmark and when I tried to find the girl I found out she had passed. Worldmark wants her original death certificate. I sent an extremely awkward to her daughter with no response. I even offered it to her but told her I’d advise against it. It’s $1200 in dues a year and we can never use it because they’re always booked. Is there anything I can do to get out of this?