SPD FIU Investigation Leads to Seizure of Illegal Firearm, Trafficking Weight of Cocaine, Fentanyl and Six Arrests

09/03/2025

SPD FIU Investigation Leads to Seizure of Illegal Firearm, Trafficking Weight of Cocaine, Fentanyl and Six Arrests

Springfield, Mass. — On Monday September 1st at approximately 6:05 a.m., members of the Springfield Police Firearms Investigation Unit (FIU) under the direction of Lieutenant Jaime Bruno, members of the Hampden County Sheriff's Department and United States Marshals Fugitive Task Force arrested six suspects after executing a search warrant on the 0-100 block of Lowell Street.

Over the past several months, Detectives have been investigating William Semidey for the illegal distribution of drugs from his home on Lowell Street. Detectives applied for and were granted a search warrant for his home, which they executed Monday morning.

Detectives detained five adults and a 16-year-old male. Two small children were also inside the home.

During a search of the home, Detectives recovered approximately 258 grams of cocaine, 387 bags of fentanyl, $8512 in cash, a loaded firearm and additional ammunition. Detectives arrested William Semidey, Jennifer Plumey, Jordan Montalvo, Justin Semidey, Oscar Carrasco and the 16-year-old juvenile.

46-year-old William Semidey of Springfield is charged with:

Cocaine Trafficking 200+ Grams
Possession with the Intent to Distribute a Class A Drug
Conspiracy to Violate Drug Law
Possession of a Firearm without an FID Card - Subsequent Offense
Possession of a Firearm during the Commission of a Felony
Improper Storage of a Firearm
Possession of Ammunition without an FID Card
Reckless Endangerment of a Child (Two Counts)
Possession of a Firearm with Three Prior Violent/Drug Crimes

40-year-old Jennifer Plumey of Springfield is charged with:

Cocaine Trafficking 200+ Grams
Possession with the Intent to Distribute a Class A Drug
Conspiracy to Violate Drug Law
Possession of a Firearm during the Commission of a Felony
Improper Storage of a Firearm
Reckless Endangerment of a Child (Two Counts)

20-year-old Jordan Montalvo of Springfield is charged with:

Cocaine Trafficking 200+ Grams
Possession with the Intent to Distribute a Class A Drug
Conspiracy to Violate Drug Law
Carrying a Firearm without a License
Carrying a Loaded Firearm without a License
Possession of a Firearm during the Commission of a Felony
Improper Storage of a Firearm
Possession of Ammunition without an FID Card
Reckless Endangerment of a Child (Two Counts)

20-year-old Justin Semidey of West Hartford, Connecticut is charged with:

Cocaine Trafficking 200+ Grams
Possession with the Intent to Distribute a Class A Drug
Conspiracy to Violate Drug Law
Carrying a Firearm without a License
Carrying a Loaded Firearm without a License
Possession of a Firearm during the Commission of a Felony
Improper Storage of a Firearm
Possession of Ammunition without an FID Card
Reckless Endangerment of a Child (Two Counts)

45-year-old Oscar Carrasco of Springfield is charged with:

Cocaine Trafficking 200+ Grams
Possession with the Intent to Distribute a Class A Drug
Conspiracy to Violate Drug Law
Possession of a Firearm without an FID Card
Possession of a Firearm during the Commission of a Felony
Improper Storage of a Firearm
Possession of Ammunition without an FID Card
Reckless Endangerment of a Child (Two Counts)

The name, charges and booking photo of the 16-year-old arrested will not be released due to his age.