In the 2007 film *I Am Legend*, several key characters and companions meet their end, with the protagonist’s fate varying significantly between the theatrical and alternate versions of the movie.
### **1. Dr. Robert Neville (Will Smith)**
* **Theatrical Ending:** Neville dies a martyr. As the Darkseekers break into his laboratory’s reinforced plexiglass room, he realizes he has successfully created a cure using the blood of a captured test subject. He hands a vial of the cure to Anna (Alice Braga) and hides her and the boy, Ethan, in a small coal chute. To ensure their escape and the safety of the cure, Neville pulls the pin on a M67 grenade and charges at the Alpha Male and the charging pack, killing them all and himself in a massive explosion.
* **Alternate Ending:** Neville **survives**. In this version, he notices the Alpha Male drawing a butterfly shape on the glass, referencing a butterfly tattoo on the neck of the female test subject. Neville realizes the Darkseekers are sentient and simply want their mate back. He returns the female to them, apologizes for his experiments, and the Darkseekers leave him alive. He then travels to the survivor camp in Vermont with Anna and Ethan.
### **2. Samantha "Sam" (The Dog)**
* **Cause of Death:** Infection and Mercy Killing.
* **Specifics:** While defending Neville from a pack of "infected" dogs unleashed by the Alpha Male, Sam is bitten. Since she is not immune like Neville, she eventually begins to turn into a Darkseeker animal. Back at the lab, Neville attempts to save her with an experimental serum, but it fails. As she begins to snarl and attempt to maul him, Neville is forced to tearfully strangle her to death to end her suffering and protect himself.
### **3. Zoe and Marley Neville (Neville’s Wife and Daughter)**
* **Cause of Death:** Helicopter Crash.
* **Specifics:** During a flashback sequence depicting the chaotic 2009 evacuation of Manhattan, Neville puts his wife and daughter on a rescue helicopter. As they lift off, the military begins bombing the Brooklyn Bridge to contain the virus. In the chaos, another helicopter loses control and collides with the one carrying Zoe and Marley, causing it to crash and killing everyone on board while Neville watches from the ground.
### **4. The Alpha Male and Alpha Female**
* **Cause of Death:** Explosion (Theatrical Only).
* **Specifics:** In the theatrical cut, they are killed by Neville’s final grenade sacrifice. In the alternate ending, they survive and are reunited.
### **5. Dr. Alice Krippin (Emma Thompson)**
* **Cause of Death:** Implied Viral Infection/Outbreak.
* **Specifics:** Though her death is not shown on screen, she is the scientist who genetically engineered the original virus to "cure" cancer. It is implied she died early in the pandemic, as 90% of the world's population was killed by the virus within years of the initial outbreak.
### **6. The Darkseekers (Mutants)**
* **Cause of Death:** Various.
* **Specifics:** Throughout the film, Neville kills many Darkseekers using UV light traps, high-powered rifles, and his vehicle. A large number are also killed in the final laboratory assault in the theatrical version.
### **7. The Rest of Humanity**
* **Cause of Death:** The Krippin Virus (KV).
* **Specifics:** The film establishes that out of the roughly 6.6 billion people on Earth, 5.4 billion (90%) were killed by the virus. Of the remaining 1.2 billion, the vast majority (roughly 588 million) turned into Darkseekers, leaving only a tiny fraction of immune survivors.