Lizzie Piper S First Marriage

I managed to find this:
Elmer Ernest Hager married to Sarah Elizabeth Piper, 1900, St. Clair Co, Missouri. Lizzie was born in St. Clair Co, Missouri in 1882, married to a man named Haggar (Hager?) in 1900. Widowed in 1901? with one child. This could be her first marriage, need to find a date of death for Elmer.