The way JW's explain that in their eschatology is by saying the first death (and thus resurrection) is the natural death people have experienced. They will be resurrected in paradise, the second death is the death of God's judgement after 1000 years in paradise. If you go through 1000 years of paradise and still choose to go against God's Organization (the FDS who will then be in heaven), you will have condemned yourself to the second death and they don't believe there is a resurrection from that (although Revelation speaks about, and the JW Revelation book depicts, eternal torture).
It is also possible to go straight to the second death, that is if you actively oppose the JW organization (WTBTS) after learning "the truth" then it is possible God will judge you permanently right away. They often cite Hitler as deserving the second death, although officially the WTBTS does clarify although likely, humans do not judge, only God, Jesus and the 144,000 (aka themselves) end up being judges.
A bit of explanation on the second death:
https://www.jw.org/finder?wtlocale=E&docid=1101973019&srctype=wol&srcid=share
The WTBTS leadership will be judges:
https://www.jw.org/finder?wtlocale=E&docid=1101973017&srctype=wol&srcid=share