DLM Investigations
Real Investigations. Real Credentials. Real Results
Diane says "BEWARE OF SCAM PIs. Hire someone you can trust to get the work done."
With over 30 years of real investigative experience, Diane brings professionalism, discretion, and results to every case. From sensitive personal matters to complex investigations, your case is handled with integrity and care.
Experienced Private Investigation Services
When you need answers, choosing the right private investigator matters. DLM Investigations provides discreet, professional, and results-driven investigation services tailored to your situation.
We handle sensitive cases with precision and confidentiality, offering services such as surveillance, executive protection, criminal investigations, undercover scams, and more. Every case is approached with careful attention to detail, no lead overlooked.
We handle the case directly from start to finish, ensuring clear communication and trusted results.
5000+
Completed Investigations
30
Years of Combined Experience
95%
Client Satisfaction
"If you see me in your rear view mirror - it's not a good thing."
DLM Investigations
DLM Investigations is led by Diane L. Matuszak, a highly experienced investigator with a distinguished law enforcement background. A retired NYPD 2nd Grade Detective and former Detective in Lisbon, Wisconsin, Diane has built her career on integrity, discretion, and results.
Throughout her years in law enforcement, she handled complex and sensitive cases including narcotics operations, homicide investigations, missing persons, and personal matters requiring absolute confidentiality. Her experience gives her the insight and determination needed to uncover the truth, no matter how challenging the case.
When you hire DLM Investigations, you work directly with Diane. There is no middleman and no outsourcing. Every case is personally managed from start to finish with careful attention to detail.
Known for being personable, tough, and thorough, Diane is committed to finding the answers you seek while treating every client with respect. Her reputation is built on trust and dedication to doing what is right.
No investigation is too small. No detail is overlooked. Every case is handled with the highest level of confidentiality.
Your case is 100% confidential
Diane handles every case personally — no outsourcing
Personable, professional, and tough when it matters
Thorough investigations with attention to every detail
Proven experience preparing cases for trial
No case is too small
Frequently Asked Questions
Learn how DLM Investigations helps individuals, victims, and attorneys uncover the truth through professional investigative services.
