Palestinian attacks against Israeli settlers and soldiers occur sporadically in the West Bank.
He was shot while sitting in his auto at the junction.
"That same assailant fired with that weapon toward three vehicles", he said, with the third auto targeted stopping.
The army also did not say whether the suspected Palestinian assailant was affiliated with a militant group or had acted alone.
Relatives of Ettinger, who headed a religious seminary and had 12 children, told local media that after he was shot he fired back several times in the direction of the gunman.
More than 260 Palestinians have also been killed over the same period.
Israel's president, Reuven Rivlin, said: "Rabbi Ettinger's life's work will continue and be among us even after his passing, and the strength he gave his pupils and the community he led will continue to strengthen us through the enormous grief and sorrow".
Another IDF soldier was seriously wounded by the shooting at the Gitai Avisar Junction during the second phase of the attack.
The attack began when a Palestinian grabbed a gun from an Israeli near a Jewish settlement in the West Bank and then shot him.
Israel is due to hold an election on 9 April.
"The people of Israel are mourning the murder of Rabbi Achiad Ettinger", Prime Minister Benjamin Netanyahu tweeted.
Regev said Gantz, who heads the centrist Blue and White party, would seek the support of an Arab legislator whom she accused of inciting Palestinian violence. Gantz, a former armed forces chief, said Regev was using Israeli deaths for "political propaganda".
"Overnight, IDF troops, along with ISA, Border Police and Israeli Police forces operated in the villages of the Qalqilya district, as part of the ongoing pursuit of the terrorist who carried out the lethal attacks yesterday morning", an IDF statement revealed early Monday morning. Israeli-Palestinian peace talks collapsed in 2014. A higher proportion of victims were civilians compared with the year before.
"One Israeli is dead", Israeli army spokesman Lieutenant Colonel Jonathan Conricus said of the attack near the Ariel junction southwest of Nablus. The only post to ever raise suspicions about his intentions, was a condemnation of Israeli security forces entering Temple Mount last summer.
At least one person was killed and two others wounded in a shooting and stabbing attack in the occupied West Bank.