Limit law of a second class particle in TASEP with non-random initial condition

We consider the totally asymmetric simple exclusion process (TASEP) with non-random initial condition having density $\rho$ on ${\mathbb{Z}}_{-}$ and $\lambda$ on ${\mathbb{Z}}_{+}$, and a second class particle initially at the origin. For $\rho <\lambda$, there is a shock and the second class particle moves with speed $1-\lambda -\rho$. For large time $t$, we show that the position of the second class particle fluctuates on a $t^{1\mathrm{/}3}$ scale and determine its limiting law. We also obtain the limiting distribution of the number of steps made by the second class particle until time $t$.