Details on transfer of name in property based on legal heir

If there is no other heir other  than his wife she can alinate the property in her name on the basis of sucession certificate.

She can sell the property only once the documents of the property exhibit her as owner. 
You should  contact the land revenue officer(tehsil dar) and submit the application for transfer of ownership as a heir on the basis of sucession certificate.

You can get that from District court.She is having the Legal heir certificate she should try with that first, if the revenue authority asks for sucession certicate then she can get it.