To become a homicide detective, one ought to start by studying criminal justice in college and take internships or shadow a police officer. Then, typically homicide detectives work their way up in the police force. This will include training with weapons and other police force equipment. To learn more about training and education backgrounds for homicide detectives, visit: http://www.criminaljusticedegreeschools.com/criminal-justice-careers/homicide-detective/.
For employment as a homicide detective a high school diploma is required. Some college education is also recommended, perhaps in a field like criminal justice. For a complete list of the requirements and processes behind becoming a police officer, look here: http://www.bls.gov/oco/ocos160.htm.