How did King Saul's sons die?

Saul had 2 daughters and atleast 7 sons: Jonathan, Malchi-shua, Abinadab, Ish-bosheth(Eshbaal), Ishvi, Armoni and Mephibosheth. (1 Samuel 14:49+50; 2 Samuel 2:8; 21:8; 1 Chronicles 8:33)

-Jonathan, Abinadab and Malchi-shua died fighting Philistines (1 Samuel 31:2)

-Ish-bosheth was assassinated(2 Samuel 4:5-7)

-Armoni and Mephibosheth died at the hands of the Gibeonites (2 Samuel 21:8+9)

-The death of Ishvi is never mentioned.