Handyman fell down the roof

[Kimnee L.]

Hi all. I am wondering what my liability is when someone fell down my roof. Recently it was raining hard. Tenant called me, and I asked another tenant who had repaired roofs for me before. He has no license. He then took his neighbor along with him.  The brought the neighbor's ladder to the home with the roof leak.  The neighbor went up the roof then the handyman tenant went up too, but while near the roof, the ladder slid and he fell to the concrete driveway.  He was in and out of consciousness and spit out blood. He is now being incubated.  He has been a good and friendly tenant to me.  The neighbor who went with him said the roof was fine except a small hole near a pipe, and he patched the hole.  My concern is how liable I am for his injury?  

Thank you,

Kim