The CDC reported that in 2017 more than 15,482 people died from drug overdoses involving heroin in the US. That averages out to about 297 individuals each week.
Also.. per the CDC, because heroin and morphine are metabolized similarly, some heroin deaths might have been misclassified as morphine deaths, resulting in underreporting of heroin deaths.
https://www.cdc.gov/mmwr/volumes/67/wr/mm675152e1.htm?s_cid=mm675152e1_w
https://www.cnn.com/2019/01/08/politics/fact-check-trump-immigration-speech/index.html