in memory of (someone or something)
As a memorial to someone or something; to honor or remember someone or something. We planted that tree in memory of our grandfather. This monument is dedicated in memory of all the brave men and women who lost their lives defending our freedom.
in memory of somebody
intended to show respect and remind people of somebody who has died: He goes to France every year in memory of his late wife, who was French.Monuments were built in memory of those who died in the war.