Plot summary
When all of the doctors gather to see Dell's new headstone Violet announces that she and Pete are getting married, making Cooper uncertain about his and Violet's friendship. Charlotte and Sam work on a patient who needs a kidney transplant. When they suggest his brother, they find that his brother is mentally challenged and Charlotte worries about the ethics of the case. Naomi and Sheldon work to get Addison to help a case of a couple trying to get pregnant after losing their first child two years earlier. Amelia contemplates going to see Derek (or not) after he is shot.
Sam works to get Dink to step up and start helping Naomi out with Olivia and Maya; Violet and Pete get married, while Sheldon shows Charlotte that he doesn't want to be her friend anymore after she chooses Cooper over him. Addison and Sam start their relationship over again; Charlotte and Cooper begin working on plans for their wedding.
Credits
Adapted from Wikipedia contributors, Private Practice season 4. HTML formatting and reference markers removed.