Death was not created by God. It was not “created” at all. When humans sinned and pulled away from God, they caused life to malfunction, for all material living creatures including humans. (Angels are made of spirit, not matter; they are created beings but not part of the material universe of time and space.)
Death is part of that malfunction, as God warned Adam and Eve before they fell. Though of course we didn’t do it alone…
“By the envy of the Devil, death came into the world.” (Wisdom 2:24)
The interesting bit is that events in Eden seem to have occurred outside the normal universe, or were allowed to have an impact that ran both backwards and forward in time. (Not Church teaching, but logical speculation.) When God made Adam and Eve in His image and likeness, and ordered them to take care of the world, He made their actions affect all of Creation in time and space, all matter. We don’t know what the universe would have been like without the Fall.
But the other interesting bit is that not only did God allow Adam and Eve to inadvertently alter Creation to reflect their sin, He sent His Son to be the new Adam and to save Creation as well as humans, and to destroy death. We still don’t see the full impact on Creation of the new Adam, but we will see it in the new heaven and earth at the end of time. His actions also affect all of time and space even now, however.
Death can be treated as a personification in Biblical poetry, and thus can be described poetically as doing various things. But it is an absence or malfunction, not a being or creature.
The “angel of death” in the Bible is not death itself or a demon. He is an angel bringing a specific punishment to David and Jerusalem.