No, Beetee does not die in Mockingjay. Since he was injured during the Quarter Quell, he does not enter the battlefield. Instead, he works behind the scenes, designing Katniss' weapons and armor, as well as creating battle plans for District 13.
Beetee, Finnick and Katniss were taken by Plutarch Heavensbee to safety in District 13, while Johanna, Peeta and Enobaria were all taken hostage by the Capitol. Through the work of the District 13 doctors, Beetee managed to survive his injuries.
It's never made clear if she kills anyone in the arena in Catching Fire, but she does stab Finnick in the thigh during a standoff at the Cornucopia. She also wounds Beetee as he prepares to destroy the arena.
Devastated and left mentally and emotionally stranded , Johanna spent the next few years in isolation, wallowing in her sorrow and trauma. During this period of time, she served as a mentor for the tributes reaped in her district.
Given that she is willing to make the ultimate sacrifice to protect Peeta, it's safe to assume that the Morphling was committed to the rebel cause. Like the other victors, she knows the power that Katniss has as a lightning rod for the rebellion, and she knows that Katniss will not help without Peeta.
Chia Mags kisses Finnick on the mouth to briefly let him know that this is the last time she will see him. It's her way of saying "Goodbye" but in a more affectionate way.
Finnick rushes to resuscitate him as he knows he needs Peeta alive to keep Katniss going. Another clue that he is in on the rebel plan comes when Katniss is about to kill him with her arrow, and he tells her, "remember who the real enemy is," which is something Haymitch said to her before the games.
After the Second Rebellion and Panem's transition into a democratic republic, Haymitch, alongside Peeta and Katniss, return to Victors' Village in District 12, where they remain as the district is rebuilt around them.
Peeta later explained to Katniss that Johanna did this to get a reaction, since she and the other tributes obviously saw Katniss as being the most "pure" of the Victors.
The following year after Lucy Gray Baird's victory, another female tribute emerged as the Hunger Games winner. Mags Flanagan became the first victor from District 4, living off of nuts and her survival skills by creating fishhooks. She was also the first victor to move to Victor's Village before serving as a mentor.
Peeta, Annie, and Beetee vote no, while Johanna and Enobaria vote yes. After some thought, Katniss demands to kill Snow. Once she receives an agreement, she votes yes, for Prim. Realizing something is up (as Katniss would never do that), Haymitch votes yes, too.
Enobaria is the secondary antagonist from the second book of The Hunger Games trilogy Catching Fire and one of the two secondary antagonists (alongside Brutus) of the film.
Johanna asks what happened to Mags, and when Katniss tells her she says Mags was Finnick's mentor and half his family. She also explains that she saved Wiress and Beetee because Haymitch told her that if she and Katniss were going to be allies she had to save them for Katniss.
Enobaria is presumably unharmed while in the Capitol, although she is kept in captivity. When the rebels stage a suprise attack on the Capitol, they succesfully retrieve Enobaria, Peeta, and Johanna. While in District 13, Enobaria is kept alive only because of Katniss Everdeen's wishes for a pardon.
In the end, Katniss and Gale grew apart, as many childhood friends and young loves do. She needed something different in her life, and with Gale's link to Primrose's death, Katniss found a reason to cut ties. If Katniss ever wanted to find comfort again, she knew she had to return to Peeta for the long term.
Why was Katniss mad at Gale at the end of Mockingjay?
In the Mockingjay movie, Katniss confronts Gale about his role in Prim's death, which he struggles to come to terms with. Katniss, unable to look at him the same way, lets him walk away without a word and eventually ended up living with Peeta.
While the Hunger Games film never talked about it, the Catching Fire novel explained why she could only communicate through hand gestures. Katniss briefly mentioned that a previous stroke could have caused Mags' garbled speech. However, post-traumatic stress disorder could have also caused her speech incapacity.
Peeta, Johanna, and possibly Annie were held in adjacent cells. As part of their torture, they were forced to listen to each other's screams. Johanna was starved, beaten, had her head shaven, and she was soaked with water and tortured with electric shocks. This caused her to develop a fear of water.
After reading the book and watching the film, it seems clear that Lucy Gray realizes Snow was responsible for the death of his friend Sejanus Plinth (Josh Andrés Rivera). If Snow could sell his best friend down the river for personal gain, it was only a matter of time until he did the same with her.
While Prim is caring for the wounded, a second set of bombs go off, killing her, along with everyone around her. This act of treachery and shameless targeting of the innocent is what finally turns President Snow's guards against him. They believe he is to blame, when in reality, Alma Coin was responsible.
To distract the Capitol from the rescue mission, Finnick and Katniss perform a live interview to be broadcast across Panem. During this interview, Finnick reveals his backstory after the 65th Hunger Games, where he was forced into sex trafficking by Snow.
The films, trying to be as faithful to the source material as possible, naturally had to include Finnick's death as well. In this sense, Finnick is the perfect candidate for upping the stakes of the plot via his death, as his hope for a future with his partner Annie made his demise seem even more untimely.
At an unknown point in time years before the 74th Hunger Games, she was personally fired by Snow, the stated reason being due to her being too surgically enhanced.
