Ruth 1:3-5 NIV

3 Now Elimelech, Naomi's husband, died, and she was left with her two sons.
4 They married Moabite women,1 one named Orpah and the other Ruth.2 After they had lived there about ten years,

References for Ruth 1:4

5 both Mahlon and Kilion3 also died,4 and Naomi was left without her two sons and her husband.

References for Ruth 1:5