Plot summary
After Susan collapses at the wedding, Addison rushes to save her life. Charlotte finds out that her attacker is in the hospital after being stabbed by his girlfriend, and has to decide if Sam should let him live or not. While talking to Susan, Addison finds that she is going to die and calls Bizzy. Susan flat-lines when Bizzy arrives, and Addison does not resuscitate her because of the DNR she signed, enraging Bizzy. After talking with Naomi, Charlotte realizes she shouldn't tell Sam to kill Lee, and instead convinces his girlfriend to tell the police about everything. Amelia and Pete deal with a blind mother who is fighting to keep her baby. After operating on her eyes, they find that she hasn't regained her eyesight and help bring the mother and grandmother together. Addison finds her mother dead in her hotel after committing suicide because of Susan's death.
Credits
Adapted from Wikipedia contributors, Private Practice season 4. HTML formatting and reference markers removed.