Had he survived, the 51-year-old Pompton Lakes resident would have faced murder charges.
Police say his wife, Pratixabahen Patel, was seeking a divorce after 13 years of marriage.
Police say the couple's 9-year-old daughter saw the stabbing and asked neighbors to call 911 on Sunday.
Police say they found him still stabbing the woman before he grabbed another knife and slashed himself.
Get Action News on your website
