Ish-bosheth was the second king of Bnei Yisrael, and was the son of Saul. However, he is not considered an official king. Before he was king, he learned Torah all day. Ish-bosheth ruled over eleven tribes, because Judah accepted David, and not him, as their king.
Ish-bosheth was proclaimed king over Israel in 1007 BCE by Abner, the captain of Saul's army, after the death of Saul and his sons. Ish-bosheth was 40 years old at this time and reigned for two years.
However, G-d did not wish for Ish-bosheth to continue to be king, because he wanted David to rule over Bnei Yisrael, so He let Ish-bosheth be killed by two people, Rechab and Baanah. They expected a reward from David because of this. David, however, refused to give any commendation for high treason; he had both killers stoned to death. Ish-bosheth was buried in Abner's grave at Hebron.
After the death of Ish-bosheth, David took over as king.