Starting a career as a murder mystery scriptwriter can be challenging but also very rewarding. Here are some steps you can take to begin your journey:

1. Study the genre: To write a successful murder mystery script, you need to have a deep understanding of the genre. This involves reading widely in the field, watching movies and TV shows, and analyzing the techniques used to create suspense, plot twists, and character development.

2. Learn the craft of screenwriting: Even if you’re an excellent storyteller, writing a screenplay requires a unique set of skills. Take courses, read books, or work with a mentor to improve your screenwriting abilities.

3. Develop your own unique voice: Murder mystery is a crowded genre, so it’s essential to find your own unique voice to stand out from the crowd. Experiment with different styles and techniques until you find your signature style.

4. Network: Attend industry events, connect with other writers, and seek out opportunities to meet with producers, directors, and agents. Building relationships with industry professionals can help you get your foot in the door.

5. Write, write, write: The most important step in starting your murder mystery scriptwriting career is to write as much as possible. Practice your craft, develop your ideas, and create a portfolio of work that showcases your talent.

6. Submit your work: Once you have a few polished scripts, start submitting them to agents, producers, and contests. Be prepared for rejection but stay persistent and keep honing your skills.

Remember that building a successful career as a scriptwriter takes time and effort, so be patient and stay focused on your goals. Good luck!