When we think of grief, we tend to think when someone passes. The truth is, we can have grief for lots of things. A break up. A lost job. Having to give something up due to age or health. Anything we care about that is lost can trigger grief.
If we are in grief, we remain attached. Grief must go through it's 5 stages observed, felt, and unrushed. Only by recognizing and processing that grief can we reach acceptance from which we can then let go of attachment.