One person was killed in a crash on Route 46 in Roxbury on Tuesday morning, authorities said. The crash happened around 8:30 a.m. in the area of Netcong Circle and North Frontage Road, Roxbury police said. All lanes remain closed and detoured in the area of the crash as of 11:30 a.m. as police investigate, according to the state Department of Transportation. Roxbury police referred questions about the crash to the Morris County Prosecutor’s Office, which declined to offer information, citing the ongoing investigation. Our journalism needs your support. Please subscribe today to NJ.com. Jeff Go…