1- add this user to Owners group and check if he can delete the item, if yes
2- check if this user belong to the right group from this link /_layouts/user.aspx
Regards, Fadi Abdulwahab.
Please click "Propose As Answer" if a post solves your problem or "Vote As Helpful" if a post has been useful to you.
Microsoft is conducting an online survey to understand your opinion of the Technet Web site. If you choose to participate, the online survey will be presented to you when you leave the Technet Web site.